I heard about the greatest prank once but I haven't done it yetUse your friend's computer when he's not lookingCreate a new folder on the desktop called "Horse Porn" or "Kiddie Porn" or something equally embarrassingTake a screenshotDelete the folderMake the screenshot his wallpaperPWNED

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Along the same lines, after you take the screenshot and make it the wallpaper, right click on the desktop and choose to hide desktop icons. He'll try clicking on everything not knowing its just wallpaper.

Along the same lines, after you take the screenshot and make it the wallpaper, right click on the desktop and choose to hide desktop icons. He'll try clicking on everything not knowing its just wallpaper.